Method and device for eliminating direct current bias

A DC offset and data technology, applied in the direction of DC level restoration device/offset distortion correction, baseband system components, etc., can solve problems such as data distortion, affecting system performance, and inaccurate DC component estimation, and achieve the elimination of DC offset effect of shifting, suppressing burst interference, and improving RF receiving performance

Active Publication Date: 2013-12-18
大唐电信科技产业控股有限公司
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Problems solved by technology

[0008] However, when calculating the average value in practice, due to the limitation of the statistical data length, the calculated average value cannot accurately reflect the size of the DC offset
Therefore, the above-mentioned method of using the average method to eliminate the DC offset will actually introduce certain distortion to the data, which will have a certain impact on the performance of the system, such as inaccurate SNR measurement, system performance degradation, etc.
Especially for the case of sudden interference in the signal, such as figure 1 The signal waveform with burst shown in the figure, when there is burst interference, if the average value method is used to eliminate the DC offset, the estimation of the DC component will be inaccurate due to the impact of the burst interference, which will seriously affect the performance of the system

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  • Method and device for eliminating direct current bias

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Embodiment Construction

[0049] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0050] Aiming at the problem in the prior art that using the average value method to eliminate the DC offset in the case of sudden interference in the signal, the estimation of the DC component is inaccurate, thereby affecting the performance of the system, the embodiment of the present invention adopts the median method to correct the DC offset to eliminate.

[0051] It can be seen from the probability theory that as long as the length of the statistical data is long enough, the distribution of the data affected by Gaussian white noise on both sides of the 0 value is equally probable in the absence of DC offset.

[0052] Such as figure 2 Shown is a schematic diagram of a simulation result of a CDF (Cumulative...

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Abstract

The invention relates to the technical field of radio frequency receiving, and discloses a method and device for eliminating direct current bias. The method comprises the following steps: acquiring a preset amount of data received on a digital base band; calculating the median of the preset amount of data, and adopting the median as the current direct current bias; and subtracting the direct current bias from the data received on the digital base band as the data actually received on the digital base band. By adopting the method and device provided by the invention, direct current bias in radio frequency receiving can be effectively eliminated, the radio frequency receiving performance can be improved, and the burst interference which can not be overcome by an averaging method can be inhibited.

Description

technical field [0001] The invention relates to radio frequency receiving technology, in particular to a method and device for eliminating DC offset. Background technique [0002] In current radio frequency receivers, the zero-IF structure is more and more widely used. The so-called zero-IF receiver refers to the receiver structure in which the radio frequency signal is directly converted into a baseband signal with a center frequency of zero through frequency mixing. This structure has a high degree of chip integration, requires few external devices, is easy to integrate on a single chip, and has low cost and high performance. The advantage of low consumption. However, the zero-IF structure also introduces some other problems, such as DC offset, local oscillator leakage, low-noise amplifier even-order harmonic interference, flicker noise, etc. The most important issue is DC offset. [0003] The DC offset is mainly generated by the self-mixing of the local oscillator signa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/06
Inventor 王乃博严伟李丹妮
Owner 大唐电信科技产业控股有限公司
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